Samuel g



(No Model.)

S .G.HALL. BURR FOR KNITTING MACHINES.

Noi 275,198. Patented Apr. 3,1883.

WITNESSES INVENTOR A51 Z GE ZZ By in; flttorney a 45 is shown in the drawings.

' UNITED STATES P TENT OFFI E.

SAMUEL G. HALL, OF OOHOES, NEW YORK.

BURR FOR KNITTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 275,198, dated April 3, 1883.

Application filed November 24, 1882. (No model.)-

known as inside wheels or cast-oil's, and

it is in this connection that I shall describe it. It is my object to obtain for the burr compactness, durability, and simplicity ofconstruction; and to this end I have devised the article which I shall now proceed to describe by reference to the accompanying drawings, in which Figure 1 is a plan view of myimproved burr with the top disk partly broken away to show more clearly the parts lying beneath it; and

Fig. 2 is a side elevation of the same, partly in vertical central section.

The burr shown in the drawings consists of four partsviz., the detachable wings or blades A, the wing-holder B, the binding-nut O, and

I 2 the clamp-bushing D. The holder B consists of a circular metal disk, usually brass, perforated at the center for the passage of the screwthreaded tubular stem or bushing D of the clamp-bushing D, and recessed on one side, as

indicated at b, so as to leave an annular peripheral flange, B. In the periphery of the disk are formed diagonal slits for reception of the wings or blades A, which slits extend down through the flange part B of the disk. The

3 5 wings A are inserted in these slits, and on one side their shoulders are seated in the solid part of the disk, and on the opposite side their shoulders extend down in the slits to the inside face of the flange, so that they may have contact with the periphery of the clamp D, as

hereinafter described. The shanks of the wings may have a dovetail form, or only one edge of the shank may be inclined. The latter construction (which is the preferred construction) The shank of each Wing is beveled or inclined on the edge which comes next to the disk B, and in the bottom of the recess b, at the proper point, is formed an inclined annular surface, 0, against which I fit the beveled edges of the shanks,which project down through the flange B into recess b.

The outer edges of the shanks, being straight and in a plane intersecting the axis of the burr at right angles, are in a position to be clamped or pressed by a smooth flat plate. Such a clamping instrumentality is found in the clamp-bushing D. This device consists of a disk or circular plate of a diameter to fit snugly within the annularflange B, and provided with the central tubular stem or bushing, D, hereinbefore referred to, which, when the clamp is fitted into its place, extends through the central hole in the wing-holder B. When the parts are in this position the clamp-plate is drawn tightly against the sides of the shanks of the wings by the tightening or binding nut G, which is screwed upon the projecting end of the stem D. When the parts are thus assembled it will be seen that the shoulders of the wings on the side next the clamp'plate D rest and take beariu g on the periphery of said plate, which 'thus constitutes a bearing both for one edge or side of the shank of the wing and for the shoulder adjoining that side. The clamp-plate is unslitted, and can be easily removed and replaced without disturbing the wings. It can be, and in practice is, made of cast-iron,which enhances the durability of the device, and furnishes a solid permanent hearing for the wings at a point where the wear and strain mostly come. Inasmuch as the wings are placed diagonally, it becomes necessary, in order that their shoulders may take a fair hearing on the plate D, to slightly bevel the periphery of said plate, as indicated on an exaggerated scale in Fig. 2. In lieu of this construction, the periphery of the plate can be square with the sides and the bevel can be given to the shoulders, which in that event would be slightly undercut. I prefer, however, the construction shown, because the other lower end and not at the shoulder, as in my burr. This arrangement has necessitated a plate having an annular shoulder or under-cut groove on its inner face, and, moreover, the plate has not fitted within the holder. My arrangement admits, on the other hand, of the employment of a simple flat disk which fits entirely within the holder, so as to reduce materially the thickness of the burr, and furnishes a solid bearing for the wings both at the shoulder and upon the side.

WhatIclaim as new and of myinvention is-- The holder B B and'wings A, in combination with the binding-nut O and the unslitted clamp-bushing D D, formed and arranged to fit snugly within the annular rim or flange B of the holder, and to furnish a lateral bearing for one edge or side of the shanks of the wings and a peripheral bearing for the shoulder adjoining the side, as hereinbefore set forth.

In testimony whereofI havehereunto set my hand this 17th day of November, 1882.

SAMUEL G. HALL. Witnesses:

HENRY A. STRONG, JOHN RAFFERTY. 

